Old Bulgarian in the context of "Eastern Orthodox worship"

Bulgar (also known as Bulghar, Bolgar, or Bolghar) is the extinct Oghur Turkic language spoken by the Bulgars.

The name is derived from the Bulgars, a tribal association that established the Bulgar state known as Old Great Bulgaria in the mid-7th century, giving rise to the Danubian Bulgaria by the 680s. While the language initially went extinct in Danubian Bulgaria (in favour of Old Bulgarian), it persisted in Volga Bulgaria, but even there it was eventually replaced by the modern Chuvash language. Other than Chuvash, Bulgar is the only language to be definitively classified as an Oghur Turkic language.

Pliska (Bulgarian: Плиска [ˈpliskɐ], Old Bulgarian: Пльсковъ, romanized: Plĭskovŭ) was the first capital of the First Bulgarian Empire during the Middle Ages and is now a small town in Shumen Province, on the Ludogorie plateau of the Danubian Plain, 20 km northeast of the provincial capital, Shumen.

Pliska was the first capital of Bulgaria. According to legend, it was founded by Asparuh of Bulgaria in the late 7th century; this legend is archaeologically unsubstantiated. The site was originally an encampment, with the first tent-shaped buildings at Pliska of uncertain date. No evidence exists of a settlement before the 9th century, and claims that the site dates from Late Antiquity have been contested.